Pumping mechanism



Oct. 11, 1932. F. PURDY PUMPING MECHANISM Filed Aug. 8, 1928 Patented@cto 11 1932 STATES asset FREDERICK PURDY, OF FLINT, MICHIGAN, ASSIGNORTO MARVEL CABBURETER COMPANY, OF FLINT, MTGHIGAN, A GORPGRATION OFILLINOIS EUMPING MECHANISM Application filed August 8, 1928. Serial No.298,370..

This invention relates to pumping mechanism and more particularly tonovel means for feeding fuel from an automobile supply tank to thecarbureter.

The primary object of'the invention is to provide fuel pumping means ofsimple, inexpensive and durable construction designed to beautomatically controlled by pressure conditions existing in a passagewaythrough which the fluid is pumped;

A further object is to furnish fuel pumping. means including anactuating member or device designed to be automatically placed in aninoperative position due to pressure condilt tions in a, passageway.through which the pumped fluid flows.

Another object is to provide a fuel pump of the diaphragm type combinedwith a diaphragm control which automatically throws the pump out ofoperation when pressure is built up sufliciently on one side of thecontrol diaphragm.

A still further object is to provide a diaphragm pump having a camactuated member designed to continuously operate the pump so long as theactuating member is permitted free movement; and regulating meanscombined with a member for automatically throwing the same into aninoperative position when the pressure in a fluid passageway rises to apredetermined degree.

Another object is to furnish a control mechanism including a piston ordiaphragm urged in one direction by adjustable sprin means and adaptedto move in the opposite direction under fluid pressure built up in apassageway.

With the foregoing objects outlined and with other objects in view,which will appear as the description proceeds, the invention con sistsin the novel features hereinafter described in detail, illustrated inthe accompanying drawing and more particularly pointed out in theappended claims.

The accompanying drawing shows avertical sectional view of the mechanismforming the subject matter of the present 'inventionl In the drawing 1designates any suitable frame or casing, such as the cylinder block ofan internal combustion engine. This frame is provided with an aperture 2to permit a pump lever 3 to be moved in one direction by a cam orexcentric 4 on a rotatable shaft 5. If the structure is employed with aninternal combustion engine, the shaft 5 may be a part of the engineer anadditional shaft driven by the engine, but to satisfy the demands of thepresent invention, the shaft should rotate or oscillate continuouslywhile the engine is running.

Mounted on the exterior of the frame is a pump housing 6 having a neck 7which abuts against a packing washer 8 that is interposed between theneck and a flange 9 surrounding the opening 2. It will be understoodthat the housing 6 is secured to the frame 1 by any suitable means (notshown). A passageway 10 in the neck of the housing allows the pumpactuating member or lever 3 to extend into the housing.

The housing may be -formed of sections to permit the parts to be readilyassembled or dismantled and a chamber 11 is arranged within the housing.This chamber accommodates a main intermediate ring 12 and end rings 13and 14, and the, piston of the pump is formed by a diaphragm 15 made ofsome suitable flexible material which has its edge clamped between therings 12 and 13 by any suitable means, such as screws 16.. so

For the purpose of protecting the dia phragm and preventing too greatdistortion of the same, metallic guard disks 17 and 18 are mounted onopposite sides ofthe diaphragm and are secured to the latter by anypreferred means, such as rivets 19 These guards are of less diameterthanthe bore of the rings in order that the diaphragm'may not be interferedwith while reciprocating and each guard has a flared edge or periphery20 for reinforcing purposes and if desired, to limit the movements ofthe diaphragm.

An abutment 21 is secured to the diaphragm by any suitable means, suchas a screw 22 and is designed to constantly contact with the head 23 ofthe actuating lever. At

' this point, it will be noted that as the shaft 5 turns, the lever willbe forced in a clockwise direction as indicated by the arrows andconsequently, the diaphragm 15 will be moved in 1 one direction. spring24 of the coil type,

moves the diaphragm in the opposite direcagalnst the guard 18. Thisguard has a central projection 26 which centers the actuating spring. p

Whenever the pump is in operation, fluid will be drawn intothe chamber25 through a pipe 27 that leads to the pump from the storage or supplytank and the'fluid entering the pump will pass a suitable check valve 28that may be seated by a spring 29. Fluid drawn into the pump will beforced out through a passageway 30 controlled by a ball check valve 31that is seated by a spring 32, which may be adjusted or reached by themanipulation of a screw 33. After the fluid asses the check valve, itenters a duct 34 w ich communicates with a pipe 35 that leads, forinstance, to the float chamber of a carbureter.

As such float chambers are usually provided with float-operated valves,I make use of such valves for automatically controlling the operation ofthe pump. or instance, when the float chamber valveis closed, the fluidpumped cannot pass through the pipe 35 and consequently I force it throuh the in the figure of the drawing,

duct 34 into an automatic control, an

' sufiiciently by the pump,

when the pressure in this control has been built up the lever 3 will bethe position shown and at such times the lever will cease to function,even though the shaft 5 continues to turn.

The automatic control means includes parts which are quite similar tothe pumping means in order to facilitate manufacture and permitinterchanging of the parts. For instance, the diaphragm 36 ma be securedin place in the same manner as t e diaphragm 15 and it may be of thesame size as the latter and proautomatically forced into vided withsimilar guards and a similar abutment 37. In this instance, however, theprojection 38 of one of the guards willbe engaged by one end of atension spring 39 so that the spring in this instance will tend to pullthe d1aphragm36 away from the head 23 of the lever, instead of to forcethe diaphragm toward the lever. The other end of the spring 39 isconnectedby a swivel fastening 40 to an adjusting member 41, which maybe screw threaded at 42 into a sleeve 43 w ich forms part of the casing.The chamber 44 of the control means communicates with the duct 34-by aconduit 45 so that some of the fluid pumped will always occupy thecontrol chamber.

quired of t 'wall in one direction, and en nesneea is used for feedinggasoline, for instance, from the supply tank to the carbureter floatchamber of a motor vehicle or the like,.the shaft 5 turned by theengine, will move the lever 3 in a clockwise direction whenever thefloat controlled valve is opened and this will cause any fluid in thechamber 25 to be forced through 30, 34 and 35 to the float chamber. Assoon as the diaphragm has reached the limit of its pressure stroke, thespring 24 will immediately move it on its suction stroke and theabutment 21 will cause the lever to move in a counterclockwisedirection. Of course, when the piston is on its suction stroke, fuelfrom the supply tank will be drawn into the chamber 25 through the pipe27. 4

Such operation will continue as long as the float-controlled valve isopen, but as soon as it closes, the liquid being no longer able to passthrough the duct 45 into chamber 44 and as soon as the pressure is builtup suificiently in chamber 44, the diaphragm 36 will be moved toward theright a sufiicient distance to cause the abutment 37 to bring the head23 into the position shown in the drawing and consequently the right endof the lever will be held in such position that the cam 4 may continueto operate without actuating the lever.

It will be obvious to those skilled in the the details disclosed withoutdeparting from' through the pipe 35 will be forced the spirit of theinvention as expressed in" the claims.

What I claim is:

1. In pumping mechanism, a pump having a dia hragm, resilient means formoving the diap ragm in one direction, an engine operated member formoving the diaphragm in the opposite direction, a chamber having adistortable wall, and means to permit, the fluid forced by the pump toenter said chamber and move the distortable wall into engagement withsaid engine operated member to hold the engine operated member in aninoperative position.

2. In pumping mechanism, a pair of opposed chambers, each having adistortable wall and said walls arranged opposite each other, valvecoptrolled ducts for leading fuel into and discharging fuel from one ofsaid chambers, a conduit placing one of said ducts in communication withthe other chamber, resilient means for moving each distortable 'neoperated means having a part engagea le with said distortable walls andarranged to move one of said walls in one direction.

3. In pumping mechanism, a pair of opposed chambers, one chamber forminga pumping chamber and the other a control chamber, each chamber having adistortable wall and said walls opposing one another, inlet and outlet,means for the pumping chamber, means placing the outlet means incommunication with the control chamber, and actuating means for the pumphaving a part arranged between the distortable walls for actuating thedistortable wall of the pumping chamber and to be actuated by thedistortable wall of the control chamber.

4. In a pumping mechanism, opposed pumping and control chambers, each ofsaid chambers having a distortable wall, a duct placing the chambers incommunication, means for leadin fluid to the pumping chamber and for leaing the pumped fluid to a point of disposal, resilient means for movingthe distortable wall of the pumping chamber in one direction, resilientmeans for moving the distortable wall of the control chamber in onedirection, and operatingmeans including a part engageable with both ofsaid distortable walls.

5. In pumping mechanism, a pump housing having a compartment therein,detachably connected rings located in the compartment,

diaphragms having their edges clamped between the rings, opposedpumpingand control chambers arranged in the housing, said diaphragmsforming distortable walls for said chambers, means for admitting fluidinto the pumping chamber and for discharging fluid from said chamber,means to permit pumped fluid to enter the control chamber,

and means for actuating the diaphragm of the pumping chamber, thediaphragm of the control chamber beingmovable under fluid pressure toengage the lastmentioned means for discontinuing the pumping operation.

6. In a pumping mechanism, a diaphragm pump, a member for actuating saiddiaphragm, a control diaphragm arranged to one side of'said member,vsaidcontrol dia hragm being adapted to engage said mem er for holding saidmember in inoperative position, i

said control diaphragm being actuafd directly by the pressure exerted bythe fluid of tne pump.

7. In combination with a diaphragm pump, means arranged to one side ofsaid diaphragm for flexing said diaphragm in one direction, means foroscillating said means, a control diaphragm arranged on the other sideof said diaphragm and means whereby the pressure of the fluid createddirectly by the pump is permitted to move the control diaphragm inposition to stop the oscillation of said means.

8. Ina pumping mechanism, a pump having a diaphragm, resilient meansfersmoving the diaphragm in one direction, an engine operated rockingmember for moving the diaphra trol iaphragm moved b the ressure createddirectly by the pum a apte to engage said engine operated roc ing memberfor holding said member in inoperative position in the oppositedirection, and a con- 9. In a pumping mechanism for feeding signature. Y

' FREDERICK PURDY.

